How can I get two values by key from a multidimensional array?

Question

I want to get the values by key from my array:

array(2) {
  [0]=>
  array(14) {
    ["id"]=>
    string(2) "64"
    ["name"]=>
    string(9) "Freddy"
    ["firstname"]=>
    string(7) "Lang"
  }
  [1]=>
  array(14) {
    ["id"]=>
    string(2) "77"
    ["name"]=>
    string(6) "Samual"
    ["firstname"]=>
    string(5) "Johnson"

  }
}

$id = array_column($array, 'id');
$firstname = array_column($array, 'firstname');
$name = array_column($array, 'name');
echo "<select>";
  echo implode('<option value ="'.$id.'"'>'.$firstname.' '.$name.'</option>); 
echo "</select>";

But I get a blank page as result.

you may use `foreach` to do this, why you want to do this this way? — hassan, Mar 21 '17 at 11:15
Your `implode()` function doesn't look correct, you need glue and an array. — JustBaron, Mar 21 '17 at 11:15
@ConstantinGALBENU I tested it. I do not have a blank page now. But my select box is empty. — peace_love, Mar 21 '17 at 11:19
@Jarla: it's totally false, `foreach` is faster than all array functions. — Casimir et Hippolyte, Mar 21 '17 at 11:20
@ConstantinGALBENU I get the error implode(): Invalid arguments passed; — peace_love, Mar 21 '17 at 11:20
it is not the prober way to do this using implode in this context — hassan, Mar 21 '17 at 11:23
@hassan Ah ok, I understand, so is it possible to put `` after the array? — peace_love, Mar 21 '17 at 11:24
foreach is faster than array_{map,walk} http://stackoverflow.com/questions/18144782/performance-of-foreach-array-map-with-lambda-and-array-map-with-static-function — hassan, Mar 21 '17 at 12:08

score 2 · Answer 1 · answered Mar 21 '17 at 11:27

2

using implode is not the prober way in this context:

using foreach:

echo '<select>';
foreach ($array as $key => $value) {
    echo '<option value ="'.$value['id'].'">'.$value['firstname'].' '.$value['name'].'</option>';
}
echo '</select>';

answered Mar 21 '17 at 11:27

hassan

7,484
2
23
33

Ok, I use foreach if this is the best way :) – peace_love Mar 21 '17 at 11:28
I don't agree with your statement: `using implode is not the proper way in this context:`; `implode` is fine if used the right way. Anyway, your solution is OK :) – Constantin Galbenu Mar 21 '17 at 11:29
@ConstantinGALBENU greeting, as i said it is not the prober way in **this context**, and don't meant that is implode can not do task like this -*even as a work-around*- – hassan Mar 21 '17 at 12:01
for example, your solution is pretty cool, but if the `id` element is was the array key ? array map it self does not return the array key, and you will need to use array_walk for example, while you can easily handle this using foreach – hassan Mar 21 '17 at 12:05

Constantin Galbenu · Accepted Answer · 2017-03-21T11:30:44.717

1

You could use array_map to transform the input array into the html code for a <option> then implode all, using only one statement:

echo "<select>" . implode('', array_map(function($row) { 
     return '<option value="'.$row['id'].'">'. $row['firstname'] .' '. $row['name'].'</option>';
 }, $array )) . "</select>";

edited Mar 21 '17 at 11:30

answered Mar 21 '17 at 11:25

Constantin Galbenu

15,934
3
28
43

Is this a better way than using foreach? – peace_love Mar 21 '17 at 11:27
I like more the functional approach but it really depends on your taste. – Constantin Galbenu Mar 21 '17 at 11:28
Are there any advantages or disadvantages or is it just a matter of taste? – peace_love Mar 21 '17 at 11:29
My solution has only one statement. – Constantin Galbenu Mar 21 '17 at 11:31
@ConstantinGALBENU So faster if there is a lot of data – peace_love Mar 21 '17 at 11:32

How can I get two values by key from a multidimensional array?

2 Answers2